THEMIS peer Instrument CDR 1 CETP, Paris, April 8, 2004

THEMIS Mission Status

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Peer UCB Instrument Critical Design Review

UCB, April 19/20, 2004

Vassilis Angelopoulos

University of California - Berkeley

THEMIS peer Instrument CDR 2 CETP, Paris, April 8, 2004

Past to ~present• Phase B selection: Mar 22, 2003• Science/Systems Requirements Review – Jun/Jul 2003• PDR – peer: Oct 8/9/15/16, 2003, Mission: Nov 13-14, 2003• Confirmation Readiness Review – GSFC, Feb 4, 2004• Confirmation Review – First attempt: HQ, Mar 4, 2004 (Aborted)

– GSFC felt necessary to further reduce schedule risk– Developed better I&T flow, increased work, validated by GSFC Engineering– Developed 2 month slack in I&T flow, pushing launch to Oct 21– Added P1 magnetics verification and calibration test– Added P1 EMC/EMI verification and calibration test– Added pressurant tank: increased mission deltaV to help:

» mass posture (refocus bus on instrument hosting);

» bus development schedule;

» a compressed ascend and commissioning scenario

– Lost dawn sector conjunctions; kept ascend schedule contingency

– Instrument work kept-on full steam (ETU production & testing)

– Test plans being detailed; test GSE/software being built

– Test facilities being refurbished, procured or built

– ETU vibration tests start April 21; electrical tests ongoing; TV: May

THEMIS peer Instrument CDR 3 CETP, Paris, April 8, 2004

~Present to near future• Peer FGM/SCM CDR – Berlin, Paris, Apr 6/8, 2004• Peer EFI/SST/ESA CDR – UCB, Apr 19/20, 2004• Peer GBO CDR – Calgary, Apr 26/27, 2004• Confirmation Review – HQ, Apr 22, 2004

– Baring further GSFC thunderbolts or risky reviews– Authority to spend >25% of cost– Can commit launch vehicle and launch date

• Mission CDR: UCB Jun 15/16, 2003– Design supported by ETU results satisfies requirements– Interfaces tested and per ICD– Flight test plans detailed and to environments expected – Probe I&T plans detailed;can test compliance with instr. Req’s

• ETU Instrument Deliveries: April 2nd – Jun 3rd, 2004• ETU Instrument I&T – starts May 28th, 2004• F1 deliveries Aug 10th – Sep 27th, 2004• F1 I&T at UCB mid-Aug to mid-Nov, 2004• F1 EMI/MAG testing at UCB: Oct 22/26, 2004

THEMIS peer Instrument CDR 4 CETP, Paris, April 8, 2004

Outlook

• We are relatively on-track despite 2-3 month delays in reviews• We turn adversity into opportunity and

– enhance technical margins

– improve development program quality

– increase science capacity

• A tribute to:– Explorer program support

– Funds keep flowing – ensuring no delays– Engineering talent present and eager– Management support in scheduling and tracking

– Tenacity, commitment and experience of team

– Engineering excellence and success oriented attitude

• Expect on time delivery of Integrated Suite at end of year:– EMI/MAG testing complete on instrument suite

– Bugs worked out with principal attributes of IDPU-BAU interaction